Call4paperz was designed, developed and deployed in 48 hours by @anderson_leite, @qmx and @vinibaggio at Rails Rumble 2010.
It's maintained by @lucianosousa and @tauil since mid 2015. Previously by @ricardovaleriano.

We are open source. If you have any ideas or bugs, please
visit our GitHub repo. Pull requests and issues are welcome!

If you have any suggestions or questions about Call4Paperz, send us
a tweet (@call4paperz).